drm/arm: malidp: Use fourcc_mod_is_vendor() helper

Rather than open-coding the vendor extraction operation, use the newly
introduced helper macro.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210610111236.3814211-2-thierry.reding@gmail.com

drivers/gpu/drm/arm/malidp_planes.c

@@ -165,7 +165,7 @@ bool malidp_format_mod_supported(struct drm_device *drm,
 		return !malidp_hw_format_is_afbc_only(format);
 	}
 
-	if ((modifier >> 56) != DRM_FORMAT_MOD_VENDOR_ARM) {
+	if (!fourcc_mod_is_vendor(modifier, ARM)) {
 		DRM_ERROR("Unknown modifier (not Arm)\n");
 		return false;
 	}